Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75910472649ba5299f5dde369de2affd34ed133f27e8f779e292af65d80ef57e' 
  AND token = 'gfCTGUvqjp0wynAzUVLCSegGbgEN1HG0n/assIEYCvQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}